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Pegasus 2 Current Analysis

Pegasus 2 Current Analysis

Owned by Ryan Scomazzon
Last updated: 2025-01-24
1 min read

Pixhawk Current Analysis

Current maximums are taken from the devices listed in Big Quad 2025 - SysInt - WARG

Available Current

  • 1.5A current lim for telem1 port

  • 1.5A current lim for all other ports combined

Connected Device Maximums

  • GPS (x2)

    • 200mA x2 = 400mA

  • PWM/GPIO pins

    • Negligible current, mostly signals

  • VTX

    • 300mA (rounded up from 280 specified)

  • LED Board Rev4

    • 60mA per LED x10 = 600mA

    • STM32 abs max 100mA (but we shouldnt get near that)

      • Realistically around 5mA. Consider it negligible

  • Diversity RX

    • On Telem 1, which has its own current limit.

  • Rangefinder

    • ≤ 70 mA avg at 12V

    • 100mA peak

  • Compass

    • Unclear

    • From components datasheet, 50+10 = 60mA

    • Round to 100mA?

  • Optical flow

    • Not specified

Conclusions

  • These devices sum to 1.5 A which is equal to the current limit

  • I rounded up for a lot of calculations but also ignore opflow

  • These are max vals and I am not concerned about the current setup reaching the limit but I think it is too close to add servos

  • Servos should be controlled off PDB with a servo module

PDB Current Analysis

  • Continuous Current

    • 500A total

    • 180s continuous rating duration

  • Burst Current

    • 1000A total

    • 5s rating time

  • 12V BEC/Regulator

    • 3A current rating

Connected

  • Rangefinder

    • ≤ 70 mA avg at 12V

    • 100mA peak

Conclusions

  • Got lots of current to spare for pumps

  • 2.9A

  • Each pump is rated for 500mA, so worst case of 2 pumps, we are still chillin and can run they way overcurrent